In 2016, the Toyota Camry mid-size sedan and Sienna minivan were rated 78.5 percent American-made, while different analyses in past years have dubbed the Camry the "most American" vehicle.

The Honda Accord mid-size sedan was determined to be 81 percent American-made last year, while the Chevrolet Corvette sports car came in at 83 percent. The Ford F-150 full-size pickup truck was at 85 percent, according to the study.

A trio of General Motors crossovers based on the same platform—the Chevy Traverse, GMC Acadia, and Buick Enclave—were rated 90 percent American-made.

Like the Model S and Model X, the Model 3 will be assembled at the Tesla plant in Fremont, California.

The battery pack and cells are a major component in any electric car.

One reason the Nissan Leafs built in Tennessee aren't all-American is that while their cells and battery packs are assembled in an adjacent plant, the high-value electrode material that goes into the cells is still fabricated in Japan and shipped to that factory in large rolls.